Imperial College London


Central FacultyOffice of the Provost

Associate Provost (Academic Planning)



+44 (0)20 7594 6724n.alford




Miss Catherine Graham +44 (0)20 7594 3330




2..05 (in RSM) or 3.09 (in the Faculty Building)Royal School of MinesSouth Kensington Campus






BibTex format

author = {Le, Goupil F and Bennett, J and Axelsson, A-K and Valant, M and Berenov, A and Bell, AJ and Comyn, TP and Alford, NM},
doi = {10.1063/1.4934759},
journal = {Applied Physics Letters},
title = {Electrocaloric enhancement near the morphotropic phase boundary in lead-free NBT-KBT ceramics},
url = {},
volume = {107},
year = {2015}

RIS format (EndNote, RefMan)

AB - The electrocaloric effects (ECEs) of the morphotropic phase boundary (MPB) composition 0.82(Na0.5Bi0.5)TiO3-0.18(K0.5Bi0.5)TiO3 (NBT-18KBT) are studied by direct measurements. The maximum ECE ΔTmax = 0.73 K is measured at 160 °C under 22 kV/cm. This corresponds to an ECE responsivity (ΔT/ΔE) of 0.33 × 10−6 K m/V, which is comparable with the best reported values for lead-free ceramics. A comparison between the direct and indirect ECE measurements shows significant discrepancies. The direct measurement of both positive and negative electrocaloric effect confirms the presence of numerous polar phases near the MPB of NBT-based materials and highlights their potential for solid-state cooling based on high field-induced entropy changes.
AU - Le,Goupil F
AU - Bennett,J
AU - Axelsson,A-K
AU - Valant,M
AU - Berenov,A
AU - Bell,AJ
AU - Comyn,TP
AU - Alford,NM
DO - 10.1063/1.4934759
PY - 2015///
SN - 1077-3118
TI - Electrocaloric enhancement near the morphotropic phase boundary in lead-free NBT-KBT ceramics
T2 - Applied Physics Letters
UR -
UR -
VL - 107
ER -